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1.2 Network Devices and Numbering Plan
PBX Numbering Information
PBX numbering information is necessary to set up phone numbers for a VoIP network. Set the
numbers conforming to existing PBX numbering systems.
PBX Code
TIE Line Access
Number
PSTN Trunk (CO
Line) Number
Extension Number
Fax Extension
Number
Dialing Examples
The VoIP network allows you to access the PBX at one location from another to establish: (1) an
extension call, or (2) an outside call through the local PSTN as if you are calling from the same area.
Calling from Los Angeles to Chicago
To extension 301 via VoIP network
TIE line
access no.
Dial 7.
To local telephone 123-4567 via VoIP network through local PSTN
TIE line
access no.
Dial 7.
Calling from Chicago to Los Angeles
To extension 201 via VoIP network
TIE line
access no.
Dial 7.
10
Getting Started
Los Angeles
Chicago
Office
Office
35
41
7
7
9
9
200 to 299
300 to 399
500 to 599
600 to 699
Chicago
extension no.
PBX code
Dial 41.
Dial 301.
Chicago
Chicago PBX
PBX code
PSTN trunk (CO line) no.
Dial 41.
Los Angeles
extension no.
PBX code
Dial 35.
Dial 201.
Description
A unique number (ranging from 1 to 7 digits)
assigned to identify each PBX within a
network.
In this example, for convenience, each PBX
code corresponds to the last portion of the
IP address of its card; that is, because the
Los Angeles office card has the IP address
200.45.11.35, Los Angeles PBX code is 35.
An access number to use the TIE line
service.
An access number to seize a local PSTN
trunk (CO line).
A number assigned to each extension.
A number assigned to each fax extension.
phone no.
Dial 9.
Dial 123-4567.
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